JP4156418B2 - Water purifier - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water purifier having a function of detecting the lifetime of a filtration cartridge for water purification.
[0002]
[Prior art]
As is well known, tap water that is drunk as drinking water contains various odors such as various bacteria and odors of lime, and water purifiers are widely used to make this tap water safer and more delicious. Yes. This type of water purifier is divided into a stationary type, a faucet direct connection type, an undersink type, etc. depending on the installation type, but most of them filtered raw water flowing out from the faucet with a filter medium provided in the water purifier. After that, it has a structure for discharging as purified water.
[0003]
Conventionally, this type of filter medium has a function of removing water odor, mold odor, trihalomethane, etc. with an adsorbent such as activated carbon, and removing bacteria, turbidity components, etc. with a porous hollow fiber membrane. However, these are removably attached to the water purifier main body as a filtration cartridge so that they can be replaced when their lifetime is exhausted after long-term use.
[0004]
The activated carbon and the hollow fiber membrane in the filtration cartridge purify the tap water by taking impurities in the tap water into the fine structure. For this reason, the filtration cartridge cannot take in a larger amount of impurities by taking in a certain amount of impurities and reaches the end of its life.
However, since the period from the new replacement of the filtration cartridge to the end of its life varies depending on the structure of the individual water purifier and the usage environment, it is difficult to predict the replacement time for the new filtration cartridge in advance.
[0005]
In order to detect the integrated flow rate of water filtered by a water purifier, a flow rate detection means such as a rotary flow meter is provided in the flow path, and the detected integrated flow rate reaches the preset cartridge life. Some of them have a function of notifying the user by displaying such information.
Furthermore, there is a technique that makes it possible to identify the type of filtration cartridge even for a plurality of cartridges having different lifetimes. That is, a magnetic body that outputs a different magnetic signal is provided for each type of filtration cartridge, and the magnetic signal is read on the water purifier main body side to identify the type of cartridge and the cartridge life. (For example, see Patent Document 1)
[0006]
FIG. 7 is a cross-sectional view of a main part showing a conventional water purifier.
This water purifier 1 is a faucet direct connection type, and uses the water purifier main body 3 fixed to the faucet. A filtration cartridge 4 is detachably attached to the water purifier main body 3, and by operating the switching valve 10, the raw water introduced from the faucet flows through the filtration cartridge 4 and is discharged as purified water, and the raw water is directly irradiated and discharged. A path or a path for discharging raw water in a shower shape can be selectively switched.
[0007]
The flow rate measuring means 27 detects the magnetic signal of the second magnetic body 22 embedded in the rotator 33 as a purified water flow rate detecting means in the flow path where the purified water that has passed through the filtration cartridge 4 flows to the discharge port (not shown). A rotary flow meter configured as described above is provided.
The filtration cartridge 4 is provided with a first magnetic body 25 for identification. By processing this magnetic signal by the identification circuit 29 of the water purifier main body 3, the type of the filtration cartridge 4 and the cartridge reachable life can be identified. It has become.
[0008]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-656 (page 3-4, FIG. 1-3)
[0009]
[Problems to be solved by the invention]
However, the conventional water purifier as described above has the following problems.
That is, the first magnetic body 25 that is mounted on the filtration cartridge 4 so that the accumulated flow rate at the end of the life of the filtration cartridge 4 can be identified, and for calculating the integrated flow rate of purified water that is mounted on the water purifier body 3 and flows through the filtration cartridge 4. Since the provided second magnetic body 22 emits magnetic flux from the surface of each magnetic body, the magnetic flux emitted from each magnetic body interferes to improve the type detection accuracy of the filtration cartridge 4. It may be difficult, or it may be difficult to improve the measurement accuracy of the rotary flowmeter in which the second magnetic body 22 is embedded in the rotating body 33.
The present invention has been made in view of the above circumstances, and is a water purifier that prevents or suppresses interference between a magnetic body for cartridge detection and a magnetic body for flow rate detection, and improves detection accuracy. The purpose is to provide.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following configuration.
The water purifier according to claim 1, wherein the water purifier is detachably attached to the water purifier main body, and filters the raw water introduced into the water purifier, and the total amount of water that has flowed through the filter cartridge after the start of use of the filter cartridge. A water purifier having means for calculating a flow rate,
A first magnetic body that is mounted on the filtration cartridge so that the accumulated flow rate at the end of the life of the filtration cartridge can be identified, and a second magnetic body that is mounted on the water purifier body and that calculates the integrated flow rate of water that has flowed through the filtration cartridge A magnetic body, and the first magnetic body is one-sided magnetized with an N-pole and an S-pole formed on one side of the magnetic body, from the first magnetic body at the position of the second magnetic body. The leakage magnetic flux is set to a predetermined value or less.
In this case, the predetermined value of the leakage magnetic flux is preferably 50 gauss.
[0011]
With such a water purifier, the first magnetic body that can identify the accumulated flow rate reaching the end of the life of the filtration cartridge mounted on the filtration cartridge, and the accumulated flow rate of the water that is mounted on the water purifier body and flows through the filtration cartridge A second magnetic body for calculation, and the leakage magnetic flux from the first magnetic body at the position of the second magnetic body is set to be a predetermined value or less, so that interference between the two magnetic bodies is reduced. Can do.
In particular, by setting the leakage magnetic flux from the first magnetic body at the position of the second magnetic body to 50 gauss or less, the interference between the two magnetic bodies becomes a level with no practical problem.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a water purifier according to the present invention will be described with reference to FIGS. 1 to 3. Here, for example, a faucet direct connection type water purifier will be described as an example.
In FIG.1 and FIG.2, the code | symbol 1 in a figure is a faucet direct connection type water purifier. The water purifier 1 includes a water purifier main body 3 fixed to a faucet (not shown) and a filtration cartridge 4 that is detachably attached to the water purifier main body 3.
[0013]
The water purifier main body 3 has a flow path 5 through which raw water flows from a faucet, a water purification section inflow path 6 that guides the raw water that has flowed into the filtration cartridge 4, and a discharge port (not shown) that directly discharges and discharges the raw water that has flowed in. A first raw water inflow passage (not shown) that leads to the water and a second raw water inflow passage (not shown) that leads to the discharge port (not shown) that discharges the incoming raw water in a shower shape are formed. . The switching valve 10 is provided in the branch part to these water purification part inflow paths 6, the 1st raw | natural water inflow path, and the 2nd raw | natural water inflow path. The switching valve 10 has a function of selectively flowing in the raw water that has flowed in by switching a valve body (not shown) to each inflow path. Further, the switching valve 10 is provided with a switching lever 19 for rotating the valve body.
[0014]
As shown in FIG. 2, the filtration cartridge 4 includes a cartridge body 13 and a filter body 15 provided in the cartridge body 13 with a gap 14 therebetween.
The filter body 15 flows from the raw water introduction port 16 and filters the raw water flowing into the filtration introduction port 17 through the gap 14. The activated carbon 11 and the hollow fiber membrane 12 are housed inside the filter body 15.
The activated carbon 11 is used to remove raw water odor, mold odor, trihalomethane, etc., and the hollow fiber membrane 12 is used to remove bacteria, turbidity components, etc. in the raw water.
[0015]
A water collection unit 18 that collects the purified water filtered by the filtration unit 15 is formed on the downstream side of the filtration unit 15. The water purifier main body 3 is formed with a discharge passage 21 which is a discharge port 20 having one end opened to the water collection portion 18 and the other end opened to the outside so as to communicate with the water collection portion 18. (See FIG. 1).
[0016]
On the other hand, the filtration cartridge 4 is provided with a first magnetic body 25 </ b> A (life reached integrated flow identification unit) on the joint surface with the water purifier body 3 so as to face the water purifier body 3. The water purifier main body 3 is provided with an identification circuit 29 (life reached integrated flow rate setting unit) at a position in the middle of the water purifier inflow path 6 and in the vicinity of the first magnetic body 25A. That is, the first magnetic body 25A and the identification circuit 29 function as identification means for identifying the life reached integrated flow rate of the filtration cartridge 4 provided with the first magnetic body 25A.
[0017]
As shown in FIG. 1, the water purifier 1 is provided with a filter medium lifetime measuring device 26 that includes the identification circuit 29 described above. As shown in FIG. 3, the filter medium life measuring device 26 supplies power to the life detection circuit 28, the identification circuit 29 (life reached integrated flow rate setting unit), the display circuit 30 (notification means), and these circuits. The power supply circuit 31 is provided.
The discriminating circuit 29 discriminates the first magnetic body 25 </ b> A and sets the lifetime reaching integrated flow rate of the filtration cartridge 4, and is constituted by an discriminating arithmetic circuit 32 and a filter medium lifetime setting circuit 42.
[0018]
The identification arithmetic circuit 32 processes a signal from the first magnetic body 25 when the filtration cartridge 4 is attached to the water purifier body 3, and is connected to the power supply circuit 31 via a constant current circuit 34. A magnetoresistive element 35 that reads information of the first magnetic body 25A as a magnetic resistance, an amplifier circuit 36 that amplifies the output from the magnetoresistive element 35, and an output amplified by the amplifier circuit 36 as a reference voltage And a filter medium comparison circuit 37 for comparison.
The filter medium life setting circuit 42 identifies whether the filtration cartridge 4 has a small capacity or a large capacity on the basis of the result processed by the identification arithmetic circuit 32, and determines the accumulated life flow of the filter cartridge 4 at that time to reach the reference life. This is set as the integrated flow rate.
[0019]
The life detection circuit 28 includes an integrated flow rate calculation circuit 38 (integrated flow rate calculation means) and a life comparison circuit 39 (comparison means).
The integrated flow rate calculation circuit 38 calculates an integrated flow rate of water that has flowed through the filtration cartridge 4 after the filtration cartridge 4 is attached to the water purifier main body 3. The integrated flow rate calculation circuit 38 includes a flow rate measuring means 27 and a measurement calculation circuit 40. And an integrated flow rate storage circuit 41.
[0020]
The flow rate measuring means 27 measures the flow rate of the raw water going to the filtration cartridge 4 through the water purification section inflow path 6. Specifically, the second magnetic body 22 is mounted, and the rotation speed is proportional to the magnitude of the water flow. Although a detailed configuration is not shown in the drawing, the magnetic signal is arranged between the power supply circuit and a constant current circuit, and the second magnetic body 22 is A magnetoresistive element that reads information as a magnetic resistance, an amplifier circuit that amplifies the output from the magnetoresistive element, and a filter medium comparison circuit that compares the output amplified by the amplifier circuit with a reference voltage Yes. In addition, the rotary body 33 mentioned above is arrange | positioned by the flow path from the water collection part 18 to the discharge outlet 20 through the discharge path 21, as shown in FIG.
[0021]
Here, the first magnetic body 25A mounted on the filtration cartridge 4 and capable of identifying the accumulated flow amount reaching the end of the life of the filtration cartridge 4, and the integrated flow rate of water that has been mounted on the water purifier body 3 and flowed through the filtration cartridge 4 About the 2nd magnetic body 22 for calculating (2), it is set as the structure which can reduce the interference between each magnetic body.
In the embodiment shown in FIG. 1, the first magnetic body 25A is made smaller than before, and the magnetic flux density generated from the surface of the magnetic body is reduced. That is, the leakage magnetic flux from the first magnetic body 25 at the position of the second magnetic body 22 is set to be a predetermined value or less. The set value is preferably 50 gauss or less, more preferably 30 gauss or less.
Here, with respect to the predetermined value of the leakage magnetic flux, if it is 50 gauss or less, the interference between the two magnetic bodies becomes a practically no problem level, and if it is 30 gauss or less, in the filter medium comparison circuit 37 described later, When the signal voltage and the reference voltage are compared, the influence on the flow rate measuring means 27 can be reduced to an error of the signal voltage with respect to the reference voltage or less than an allowable noise range, and the interference does not need to be considered at all.
[0022]
Next, the signal measured by the flow rate measuring means 27 is sent to the measurement arithmetic circuit 40. The measurement calculation circuit 40 calculates the flow rate of the raw water that has passed through the water purification unit inflow path 6 by processing the signal sent from the flow rate measurement means 27, and the calculated flow rate value is sent to the integrated flow rate storage circuit 41. Sent.
[0023]
The integrated flow rate storage circuit 41 integrates the flow rate values calculated by the measurement arithmetic circuit 40 and stores them as integrated flow rate values. The integrated flow rate storage circuit 41 is initialized when the filtration cartridge 4 is replaced and a new filter cartridge life reached integrated flow rate is set in the filter medium lifetime setting circuit 42.
[0024]
The life comparison circuit 39 compares the integrated flow calculated by the integrated flow calculation circuit 38 with the integrated flow reaching the reference life of the filter cartridge 4 set by the filter medium life setting circuit 42 and supplied from the filter medium life setting circuit 42. To do. As a result of comparison by the life comparison circuit 39, when the integrated flow has reached the reference life reaching integrated flow, a signal to that effect is sent to the display circuit 30. Based on the signal from the life comparison circuit 39, the display circuit 30 displays to the user with an LCD or the like when the integrated flow has reached the reference life reaching integrated flow.
[0025]
Hereinafter, the operation of the water purifier having the above configuration will be described.
First, a small-capacity filtration cartridge 4 is attached to the water purifier body 3. As a result, the identification circuit 29 is activated, and the magnetoresistive element 35 reads the magnetic resistance of the first magnetic body 25 </ b> A provided in the filtration cartridge 4 and outputs it to the amplifier circuit 36 via the constant current circuit 34. The output signal amplified by the amplifier circuit 36 is sent to the filter medium comparison circuit 37, where it is compared with the reference voltage and then sent to the filter medium life setting circuit 42 as a comparison result.
[0026]
Based on the comparison result sent from the filter medium comparison circuit 37, the filter medium life setting circuit 42 identifies the filter cartridge 4 as having a small capacity, and the filter cartridge to which the accumulated life flow for small capacity stored in advance is attached. 4 and the accumulated flow value stored in the accumulated flow storage circuit 41 of the life detection circuit 28 is initialized.
[0027]
Next, in order to use purified water, the switching valve 19 is operated to rotate the switching valve 10 to a position where the raw water from the faucet flows into the purified water inlet 6. Then, by opening the faucet, the raw water that has flowed from the faucet through the flow path 5 flows from the raw water inlet 16 into the gap 14 in the filtration cartridge 4 via the purified water inlet 6 by the switching valve 10.
[0028]
The raw water introduced to the filtration inlet 17 through the gap 14 is introduced into the filter body 15 from there and filtered by the activated carbon 11 and the hollow fiber membrane 12 inside to become purified water. Thereafter, the purified water is discharged from the water collection unit 18 through the discharge passage 21 as purified water from the discharge port 20.
[0029]
At this time, when the raw water passes through the water purifier inlet 6, the life detection circuit 28 is activated. That is, since the rotating body 33 is rotated by the flow of purified water toward the discharge port 20, the magnetic signal of the second magnetic body 22 that rotates integrally with the rotating body 33 changes. Then, by detecting this magnetic signal, the flow rate measuring means 27 measures the flow rate of the raw water (purified water amount) that goes to the filtration cartridge 4 through the water purifier inlet 6 and the measured signal is used as the measurement arithmetic circuit 40. Send to. The measurement calculation circuit 40 calculates the flow rate of the raw water that has passed through the water purification unit inflow path 6 by calculating this signal, and sends the calculated flow rate value to the integrated flow rate storage circuit 41.
[0030]
The integrated flow rate storage circuit 41 stores a result of integrating the already stored integrated flow rate value and the flow rate value sent from the measurement arithmetic circuit 40 as a new integrated flow rate value. Then, the life comparison circuit 39 compares the integrated flow value stored in the integrated flow storage circuit 41 with the reference life reaching integrated flow set in the filter medium life setting circuit 42, and the integrated flow value is determined as the reference life. When the reached integrated flow rate has been reached, a replacement time signal is sent to the display circuit 30. Based on the replacement time signal sent from the life comparison circuit 39, the display circuit 30 displays to the user that the replacement time of the filtration cartridge 4 has arrived by LCD display.
[0031]
On the other hand, when not using purified water but using raw water, by operating the switching lever 19 and turning the switching valve 10, the raw water flowing in from the faucet through the flow path 5 becomes the first raw water inflow path. Or it guide | induces to a 2nd raw | natural water inflow path, and is discharged with raw | natural water from the discharge outlet connected to each. At this time, since the raw water is not supplied to the purified water inlet 6, the integrated flow rate calculation circuit 38 does not operate, and therefore the integrated flow rate storage circuit 41 continues to hold the previous integrated flow rate value.
[0032]
According to the water purifier 1 of the present embodiment, the life reached integrated flow rate can be automatically set by the identification circuit 29 even if the filter cartridge 4 is replaced with a different type. Further, it is possible to know the arrival of the replacement time of the filtration cartridge 4 from the display circuit 30.
Further, the first magnetic body 25A mounted on the filtration cartridge 4 and capable of identifying the accumulated flow amount reaching the end of the life of the filtration cartridge 4 and the integrated flow rate of water that has been mounted on the water purifier body 3 and flowed through the filtration cartridge 4 are calculated. Even if the second magnetic body 22 is provided, the interference between the two magnetic bodies 25A and 22 is reduced to a level that does not cause a problem in practice, so that the detection accuracy can be improved.
[0033]
By the way, as a means for setting the leakage magnetic flux from the first magnetic body 25A at the position of the second magnetic body 22 to a predetermined value or less, the first magnetic body 25A is not only made smaller than the conventional one but also as described below. It is also possible to select means.
That is, as a first modification, like a first magnetic body 25B shown in FIG. 4, single-sided magnetization in which an N pole and an S pole are formed on one side of the magnetic body, and the magnetic flux generated from this magnetic body is at a close distance. You may make it close.
Further, as shown in FIG. 5 as a second modification, the first magnetic body 25C may be separated from the second magnetic body 22, and the distance between the two magnetic bodies 25C and 22 may be increased as compared with the conventional example. Specifically, the first magnetic body 25C is arranged so as to move to the outer peripheral side of the filtration cartridge 4, and the distance between the two magnetic bodies 25C and 22 is increased.
[0034]
In addition, the first magnetic body 25 may be minutely magnetized, or each magnetic body may be arranged in a direction in which the magnetic flux does not intersect as much as possible, that is, in a direction in which the magnetic flux is difficult to face. The micro-magnetization here refers to magnetization with a low applied voltage when magnetized to reduce the level of magnetization compared to normal saturation magnetization, or a magnetic material with the same shape but with low saturation magnetization. Refers to magnetization that causes saturation magnetization.
[0035]
Here, when the leakage magnetic flux from the first magnetic bodies 25A, 25B, and 25C at the position of the second magnetic body 22 is set to a predetermined value or less and means capable of reducing interference between the two magnetic bodies are summarized, It becomes like this.
(1) Increase the distance between magnetic bodies (2) Use single-sided magnetization so that the magnetic flux generated from the first magnetic bodies closes at a close distance (3) Reduce the size of the first magnetic body and generate it from the surface of the magnetic body (4) The first magnetic body A is minutely magnetized. (5) The magnetic bodies are arranged in such a direction that the magnetic fluxes do not cross as much as possible. The above (1) to (5) are each independently performed. Of course, it is possible to implement a combination of a plurality appropriately selected from these.
[0036]
The experimental results shown in FIG. 6 (a) include (A) an actual flow rate measurement value obtained by measuring an integrated flow rate using a commercially available flow meter, and a flow rate per minute when the actual flow rate is changed; (B) A measurement result obtained by measuring the integrated flow rate using the integrated flow rate calculation unit using the first magnetic body that is micro-magnetized, and (C) using the integrated flow rate calculation unit including the first magnetic body 25B that is single-sided magnetized. A measurement result obtained by measuring the integrated flow rate and (D) a measurement result obtained by measuring the integrated flow rate using a conventional integrated flow rate calculation means using the first magnetic body 25 are shown. According to this experimental result, the measurement result of (D) has a large error from the actual flow rate especially at a small flow rate, and this error is the measurement result of (B) and (C) to which the present invention is applied. It can be seen that the number is decreasing. The unit of each numerical value is liter (l).
[0037]
FIG. 6B is a graph of the table of FIG. 6A. The actual flow rate measurement values of FIG. 6A are arranged on the horizontal axis, and (B), (C), and (C The measurement result of D) is made into a bar graph to show a comparison of accumulated flow accuracy. Note that the vertical axis of the graph is the integrated flow rate (liter; l), and it can be seen that the error of (D) increases as the flow rate decreases.
[0038]
By the way, the specific configuration is not limited to the above-described embodiment, and any design change within a range not departing from the gist of the present invention is included in the present invention.
For example, in the above embodiment, the switching valve 10 and the raw water introduction hole are directly connected, but the raw water is taken out from the switching valve 10 by a hose or the like and connected to a filtration cartridge arranged at another place. Also good.
[0039]
In the above embodiment, the flow amount of water that has reached the end of the life of the filtration cartridge is identified using a magnetoresistive element. However, by using a Hall element that utilizes the Hall effect or a detection element that is similar to a Hall IC, The type may be identified more finely.
Of course, a contact type magnetic detection element such as a reed switch may be used. Furthermore, in the filtration cartridge 4, the flow amount reaching the end of life is not a magnetic material. For example, a protrusion corresponding to the amount of flow amount reaching the end of life is provided on the filtration cartridge, and a contact limit switch or The configuration may be such that the information indicated by the protrusion is read by the photoelectric switch of the contact.
[0040]
On the other hand, as the flow rate measuring means, there is provided a metering valve for making the flow rate constant in the inflow channel of the water purification unit, and the time during which the raw water passes through the metering valve is integrated to obtain an integrated flow rate value. Also good. Further, although the LCD display indicates that the filter cartridge has reached the end of its life, for example, a configuration may be used in which the user is notified by a voice synthesizer, a buzzer, an LED, or the like instead of the LCD.
[0041]
【The invention's effect】
As described above, according to the water purifier according to the present invention, the first magnetic body that makes it possible to identify the life reached integrated flow rate of the filtration cartridge mounted on the filtration cartridge, and the filter cartridge that is mounted on the water purifier main body. And a second magnetic body for calculating the integrated flow rate of the water flowing through the first magnetic body, and the leakage magnetic flux from the first magnetic body at the position of the second magnetic body is set to be a predetermined value or less. Interference between the bodies can be reduced, and as a result, a significant effect is obtained that the measurement accuracy of the life reached integrated flow rate is improved and the life reached integrated flow rate identification accuracy is improved.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing an embodiment of a water purifier according to the present invention, showing an example in which a first magnetic body is miniaturized.
FIG. 2 is a cross-sectional view of the water purifier cartridge shown in FIG.
FIG. 3 is a block diagram showing an electronic circuit configuration of the water purifier according to the embodiment of the present invention.
FIG. 4 is a partial cross-sectional view showing a first modification of the water purifier according to the present invention, showing an example in which the first magnetic body is magnetized on one side.
FIG. 5 is a partial cross-sectional view showing a second modification of the water purifier according to the present invention, showing an example in which the distance of the first magnetic body is increased.
6A and 6B show experimental results showing the effects of the present invention. FIG. 6A shows an actual flow rate measurement value obtained by measuring an integrated flow rate using a commercially available flow meter, and FIG. (1) a measurement result of measuring the integrated flow rate using the integrated flow rate calculating means using one magnetic material; (C) a measurement result of measuring the integrated flow rate using the integrated flow rate calculating means using the first magnetic body 25B that is magnetized on one side; ) A table showing the measurement result of measuring the integrated flow rate using the integrated flow rate calculating means of the conventional first magnetic body 25, and (b) is a graph of the table of (a).
FIG. 7 is a cross-sectional view showing a configuration of a conventional water purifier using a plurality of magnetic bodies.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water purifier 3 Water purifier main body 4 Filtration cartridge 5 Flow path 6 Water purifying part inflow path 10 Switching valve 20 Discharge port 21 Discharge path 22 2nd magnetic body 25A, 25B, 25C 1st magnetic body (life reach | attainment integrated flow identification part)
26 Filter medium life measuring device 27 Flow rate measuring means 29 Identification circuit (Life reaching integrated flow rate setting unit)
30 Display circuit (notification means)
33 Rotating body 38 Integrated flow rate calculation circuit (integrated flow rate calculation means)
39 Life comparison circuit (comparison means)

Claims (2)

A water purification cartridge having a filtration cartridge that is detachably attached to the water purifier main body and that filters raw water introduced therein, and means for calculating an integrated flow rate of the water that has flowed through the filtration cartridge after the use of the filtration cartridge is started. In the vessel
A first magnetic body that is mounted on the filtration cartridge so that the accumulated flow rate reaching the end of the life of the filtration cartridge can be identified, and a second magnetic body that is mounted on the water purifier body and that calculates the integrated flow rate of water that has flowed through the filtration cartridge. With magnetic material,
The first magnetic body is one-sided magnetized with N and S poles formed on one side of the magnetic body,
A water purifier, wherein the leakage magnetic flux from the first magnetic body at the position of the second magnetic body is set to a predetermined value or less. The water purifier according to claim 1, wherein the predetermined value of the leakage magnetic flux is 50 Gauss.

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